This shifts MD from a static calculation to a . Final Thought Maximum Demand is not about what could happen. It is about what reasonably will happen over 30 minutes, under normal use. Master the diversity tables, respect harmonics, and understand the economic consequences. That is the difference between a compliant design and an optimal one.

| Load | AS3000 Rule | Calculation | Result (A) | |------|-------------|-------------|-------------| | Lighting | C5: First 10A @100%, rest @50% | 10 + (10×0.5) | 15 | | Sockets (2 circuits) | C6: 10A + 50% of remaining (16 outlets = 16A assumed total) | 10 + (6×0.5) | 13 | | Cooktop | C8: (0.4 × 27.8) + 10 | 11.1 + 10 | 21.1 | | Oven | C8: (0.4 × 20) + 10 | 8 + 10 | 18 | | Hot water | C7: No diversity (storage) | 15.6 | 15.6 | | AC | C9: Largest unit 100% | 16 | 16 |

This post is intended for electrical engineers, trade professionals, and advanced students. Most electricians size a circuit breaker for the cable. Fewer truly master the art of Maximum Demand (MD) . In AS/NZS 3000, MD is not a worst-case guess; it is a calculated engineering decision that dictates the economics and safety of the entire installation.